YMF721 datasheet(12/41 Pages) LSI

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YMF721

July 10, 1997

- 12 -

5-1-2. No ISA BUS Connect System

When YMF721 (OPL4-ML2) is not connected with ISA bus, power down operation can be controlled

by sending Yamaha's original System Exclusive Message as the MIDI data. The System Exclusive

Message includes the following three byte ID.

43h, 79h, 04h : Yamaha YMF721(OPL4-ML2) ID

The System Exclusive Message is as follows.

F0h, <Yamaha YMF721(OPL4-ML2) ID>, <Command>, <Data>, F7h

YMF721 (OPL4-ML2) supports the following commands and data.

Command

Data

Function

0Eh

6Dh

Power Down Command

0Fh

6Bh

Internal Micro-processor Reset Command

Command write “FDh”

Control write PDY=1, PDX=0

(wait time ~100 msec)

Control write PDY=0, PDX=0

all clock (X’tal)disable

Synthesizer clock disable

Synthesizer clock enable

~30msec

~3msec

Status read GBUSY=0

Normal Operation

Power down sequence when connected with ISA bus

YMF721 bảng dữ liệu(PDF) 12 Page - LSI Computer Systems